Nitecore NFR60 Filter Diffuser Diameter 60mm

Features:* Premium double-sided mineral-coated glass lens provides high light transmittance and excellent heat resistance.* Filter frame is constructed from high quality rubber for extreme durability and impact resistance.* Flexible filter frame is adaptable to a head diameter range of 60mm* Features a small lanyard attachment hole.* With the lens removed the filter may be used as a bezel protector.

Red filter - (NFR60)The Red filter is great for penetrating fog and smoke, and ideal for signaling. Red is also ideal when you want to preserve your night vision. Hunters use the red filter to avoid disturbing animals during pre-dawn hours -- animals see poorly in the red color spectrum. The filter is also useful for close range, non-tactical applications -- such as map reading -- as it reduces the intensity of light output.